3061-90-3Relevant articles and documents
Hydrolytic cleavage of pyroglutamyl-peptide bond. III. A highly selective cleavage in 70% methanesulfonic acid
Hashimoto, Tadashi,Ohki, Kazuhiro,Sakura, Naoki
, p. 2033 - 2036 (1996)
A method for highly selective cleavage of pGlu-peptide linkages in 70% methanesulfonic acid (MSA) is described. When pGlu-Ala-Phe-OH, pGlu-His-Pro- OH and dog neuromedin U-8 (d-NMU-8) (1-7)-OH (pGlu-Phe-Leu-Phe-Arg-Pro-Arg- OH) were hydrolyzed in 70% MSA at 60°C for 3 h or at 25°C for 3 d, the pGlu-peptide linkage was predominantly cleaved to give H-Ala-Phe-OH, H-His- Pro-OH and H-Phe-Leu-Phe-Arg-Pro-Arg-OH, in high yields. The results indicated that pGlu-peptide linkages are highly susceptible to 70% MSA, whereas the amide bond of the pyrrolidone moiety of the pGlu residue and other internal peptide bonds are extremely resistant.
A dynamic combinatorial library for biomimetic recognition of dipeptides in water
Klepel, Florian,Ravoo, Bart Jan
supporting information, p. 1588 - 1595 (2020/09/16)
Small peptides are involved in countless biological processes. Hence selective binding motifs for peptides can be powerful tools for labeling or inhibition. Finding those binding motifs, especially in water which competes for intermolecular H-bonds, poses an enormous challenge. A dynamic combinatorial library can be a powerful method to overcome this issue. We previously reported artificial receptors emerging form a dynamic combinatorial library of peptide building blocks. In this study we aimed to broaden this scope towards recognition of small peptides. Employing CXC peptide building blocks, we found that cyclic dimers of oxidized CFC bind to the aromatic peptides FF and YY (K ≈ 229-702 M-1), while AA binds significantly weaker (K ≈ 65-71 M-1).
Highly Productive Continuous Flow Synthesis of Di- and Tripeptides in Water
Jolley, Katherine E.,Nye, William,González Ni?o, Carlos,Kapur, Nikil,Rabion, Alain,Rossen, Kai,Blacker, A. John
, p. 1557 - 1565 (2017/10/25)
The reaction of amino acid derived N-carboxyanhydrides (NCAs) with unprotected amino acids under carefully controlled aqueous continuous flow conditions realized the formation of a range of di- and tripeptide products in 60-85% conversion at productivities of up to 535 g·L-1h-1. This required a fundamental understanding of the physicochemical aspects of the reaction resulting in the design of a custom-made continuous stirred tank reactor (CSTR) with continuous solids addition, high shear mixing, automated pH control to avoid the use of buffer, and efficient heat removal to control the reaction at 1 ± 1 °C.
Coupling-Reagent-Free Synthesis of Dipeptides and Tripeptides Using Amino Acid Ionic Liquids
Furukawa, Shinya,Fukuyama, Takahide,Matsui, Akihiro,Kuratsu, Mai,Nakaya, Ryotaro,Ineyama, Takashi,Ueda, Hiroshi,Ryu, Ilhyong
supporting information, p. 11980 - 11983 (2015/08/18)
A general method for the synthesis of dipeptides has been developed, which does not require any coupling reagents. This method is based on the reaction of readily available HCl salts of amino acid methyl esters with tetrabutylphosphonium amino acid ionic liquids. The isolation procedure of stepwise treatment with AcOH is easy to carry out. The method was extended to the synthesis of tripeptide, tyrosyl-glycyl-glycine, present in IMREG-1, also.
A green route for the synthesis of a bitter-taste dipeptide combining biocatalysis, heterogeneous metal catalysis and magnetic nanoparticles
Ungaro, Vitor A.,Liria, Cleber W.,Romagna, Carolina D.,Costa, Natália J. S.,Philippot, Karine,Rossi, Liane M.,Machini, M. Teresa
, p. 36449 - 36455 (2015/05/13)
There is increasing demand for green technologies to produce high-solubility and low-toxicity compounds with potential application in the food industry. This study aimed to establish a clean, synthetic route for preparing the bitter-taste dipeptide Ala-Phe, a potential substitute for caffeine as a food additive. Synthesis of Z-Ala-Phe-OMe starting from Z-Ala-OH and HCl·Phe-OMe was catalysed by thermolysin at 50 °C in buffer (step 1). Z-Ala-Phe-OMe ester hydrolysis to give Z-Ala-Phe-OH at 37 °C in 30% acetonitrile/buffer was catalysed by α-bovine chymotrypsin (αCT), protease with esterase activity (step 2). Hydrogenation of Z-Ala-Phe to give the desired Ala-Phe was catalysed by C/Pd in methanol (step 3). Steps 2 and 3 were optimized by using the magnetically recoverable recycling enzyme Fe3O4@silica-αCT and the magnetically recoverable metal nanocatalyst Fe3O4@silica-Pd, respectively. This inspiring combination of technologies and the original results demonstrate the suitability of using enzymes, metal catalyst and magnetic nanoparticles for easy, economical, stereoselective, clean production of an important target compound. Besides, they add to the development of peptide chemistry and catalysis.
Redox-triggered changes in the self-assembly of a ferrocene-peptide conjugate
Adhikari, Bimalendu,Kraatz, Heinz-Bernhard
supporting information, p. 5551 - 5553 (2014/05/20)
Ultrasonication of a ferrocene conjugate of a short amyloid peptide (Aβ18-20) in toluene causes formation of an organogel, which undergoes dramatic structural changes upon oxidation from a nanofibrillar network to spherical micelles. This morphological change is redox-controlled and reversible. the Partner Organisations 2014.
Direct asymmetric intermolecular aldol reactions catalyzed by amino acids and small peptides
Cordova, Armando,Zou, Weibiao,Dziedzic, Pawel,Ibrahem, Ismail,Reyes, Efraim,Xu, Yongmei
, p. 5383 - 5397 (2008/02/13)
In nature there are at least nineteen different acyclic amino acids that act as the building blocks of poly-peptides and proteins with different functions. Here we report that α-amino acids, β-amino acids, and chiral amines containing primary amine functions catalyze direct asymmetric intermolecular aldol reactions with high enantio-selectivities. Moreover, the amino acids can be combined into highly modular natural and unusual small peptides that also catalyze direct asymmetric intermolecular aldol reactions with high stereoselectivities, to furnish the corre sponding aldol products with up to > 99% ee. Simple amino acids and small peptides can thus catalyze asymmetric aldol reactions with stereoselectivities matching those of natural enzymes that have evolved over billions of years. A small amount of water accelerates the asymmetric aldol reactions catalyzed by amino acids and small peptides, and also increases their stereoselectivities. Notably, small peptides and amino acid tetrazoles were able to catalyze direct asymmetric aldol reactions with high enantioselectivities in water, while the parent amino acids, in stark contrast, furnished nearly racemic products. These results suggest that the prebiotic oligomerization of amino acids to peptides may plausibly have been a link in the evolution of the homochirality of sugars. The mechanism and stereochemistry of the reactions are also discussed.
Small peptides as modular catalysts for the direct asymmetric aldol reaction: Ancient peptides with aldolase enzyme activity
Zou, Weibiao,Ibrahem, Ismail,Dziedzic, Pawel,Sunden, Henrik,Cordova, Armando
, p. 4946 - 4948 (2007/10/03)
Simple peptides and their analogues having a primary amino group as the catalytic residue mediate the direct asymmetric intermolecular aldol reaction with high stereoselectivity and furnish the corresponding aldol products with up to 99% ee; this intrinsic ability of highly modular peptides may explain the initial molecular evolution of aldolase enzymes. The Royal Society of Chemistry 2005.
Carbamoylation of amino groups in peptides via N-aryloxycarbonyl intermediates
-
, (2008/06/13)
Method of synthesising peptides containing one or more amino acid residues bearing an N-carbamoyl functional group, by aminolysis of N-aryloxycarbonyl derivatives, which are excellent synthesis intermediates for the preparation of various peptides containing amino acid residues bearing a ureino group, such as citrulline, homocitrulline, 2-amino-4-ureidobutyric residues.
Hydrolytic cleavage of pyroglutamyl-peptide bond. II. effects of amino acid residue neighboring the pglu moiety
Saito, Susumu,Ohki, Kazuhiro,Sakura, Naoki,Hashimoto, Tadashi
, p. 768 - 770 (2007/10/03)
We studied the susceptibility of the pyrrolidone moiety and the pyroglutamyl-peptide bond at pGlu-X-Ala-Phe-OH (X = Gly, Ala, Tyr, Ile, Pro, His, Lys, Arg, Thr, Ser, Asp, Glu and Trp) to 1N HCl or 2M trifluoromethanesulfonic acid at 60°C. Here we describe the rates of the cleavage reaction of the pGlu-X bond, the pyrrolidone ring-opening reaction of the pGlu moiety and the hydrolysate accumulation. The rank order of the susceptibility rates of the cleavage reactions was Ser > Pro, Gly > Arg, Ala, Glu, Thr, Asp > His, Lys > Trp, Tyr, Ile, and that of the ring-opening reaction was Ile > Tyr, Trp > Arg, His, Lys, Asp > Glu > Ala > Pro, Gly > Ser > Thr. The rank order of the half-lives of the model peptides was Pro > Arg, Lys, Ile > His, Glu > Ala, Tyr > Asp > Gly > Ser > Thr. The results indicated that a bulky and sterically hindered side chain of the amino acid residue neighboring the pGlu moiety favors the ring-opening reaction, and retards the decomposition on acid hydrolysis and the cleavage reaction. Thus, the ring-opening and the cleavage reactions were greatly affected by the amino acid residue neighboring the pGlu moiety in the hydrolysis of pGlu-peptides.